Flew 4 times within a space of 6 days with LAN in Argentina and Chile. The first flight was cancelled and we were only informed on arriving at the airport. The check-in staff were very unhelpful and told us to go to the ticket office in the centre of Puntas Arenas (a 20 minute taxi ride away). The staff there weren't much help either and couldn't find space on an alternative flight so we eventually went by bus (14 hours) the next day. We did get our money back though. Flights 2 and 3 were fine. The food was pretty dire - 3 biscuits one of which contained Ham. Puerto Iguazu to Buenos Aires landed at the wrong airport in BA (not the one that was scheduled. Luckily we didn't have a connecting flight. If you did have a connecting flight then you had too get a taxi which you had to pay for. Overall not a good airline but there isn't a huge selection in Argentina and Chile so you would struggle to avoid it.